The Grand Cuisine Electric Pepper/Salt Mill Duo Set, Stainless Steel has two each PM-709 in a metal case with clear acrylic lid and snap-down clasp. (Salt and pepper not included.) These attractively designed pepper/salt mills operate with light pressure on the top button. Four (4) AA batteries (not included) are installed in each mill by twisting off the stainless steel top. Pulling the black battery and motor internal holder upward allows easy filling of the peppercorn or coarse salt well. Peppercorn/coarse salt well is transparent to indicate when refilling is necessary. Openly accessible (under the base) are (1) the grind adjustment screw, from fine to coarse, and (2) a small light that goes on each time you use the grinder to see how much is being dispensed. Ceramic grinder. Pepper/salt well capacity: 2 oz. by volume.